AppKit in Apple Mac OS X 10.4.11 inadvertently makes an NSApplication mach port available for inter-process communication instead of inter-thread communication, which allows local users to execute arbitrary code via crafted messages to privileged applications.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41314
http://www.vupen.com/english/advisories/2008/0924/references
http://www.us-cert.gov/cas/techalerts/TA08-079A.html
http://www.securitytracker.com/id?1019647
http://www.securityfocus.com/bid/28340
http://www.securityfocus.com/bid/28304
http://secunia.com/advisories/29420
http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html